/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.translation.types;



import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.api.common.typeutils.TypeSerializer;

import com.bff.gaia.api.common.typeutils.TypeSerializerSchemaCompatibility;

import com.bff.gaia.api.common.typeutils.TypeSerializerSnapshot;

import com.bff.gaia.api.common.typeutils.base.TypeSerializerSingleton;

import com.bff.gaia.core.memory.DataInputView;

import com.bff.gaia.core.memory.DataOutputView;



import java.io.IOException;



/** {@link TypeSerializer} for values that were encoded using a {@link Coder}. */

public final class EncodedValueSerializer extends TypeSerializerSingleton<byte[]> {



  private static final long serialVersionUID = 1L;



  private static final byte[] EMPTY = new byte[0];



  @Override

  public boolean isImmutableType() {

    return true;

  }



  @Override

  public byte[] createInstance() {

    return EMPTY;

  }



  @Override

  public byte[] copy(byte[] from) {

    return from;

  }



  @Override

  public byte[] copy(byte[] from, byte[] reuse) {

    return copy(from);

  }



  @Override

  public int getLength() {

    return -1;

  }



  @Override

  public void serialize(byte[] record, DataOutputView target) throws IOException {

    if (record == null) {

      throw new IllegalArgumentException("The record must not be null.");

    }



    final int len = record.length;

    target.writeInt(len);

    target.write(record);

  }



  @Override

  public byte[] deserialize(DataInputView source) throws IOException {

    final int len = source.readInt();

    byte[] result = new byte[len];

    source.readFully(result);

    return result;

  }



  @Override

  public byte[] deserialize(byte[] reuse, DataInputView source) throws IOException {

    return deserialize(source);

  }



  @Override

  public void copy(DataInputView source, DataOutputView target) throws IOException {

    final int len = source.readInt();

    target.writeInt(len);

    target.write(source, len);

  }



  @Override

  public TypeSerializerSnapshot<byte[]> snapshotConfiguration() {

    return new TypeSerializerSnapshot<byte[]>() {

      @Override

      public int getCurrentVersion() {

        return 1;

      }



      @Override

      public void writeSnapshot(DataOutputView out) throws IOException {}



      @Override

      public void readSnapshot(int readVersion, DataInputView in, ClassLoader userCodeClassLoader)

          throws IOException {}



      @Override

      public TypeSerializer<byte[]> restoreSerializer() {

        return new EncodedValueSerializer();

      }



      @Override

      public TypeSerializerSchemaCompatibility<byte[]> resolveSchemaCompatibility(

          TypeSerializer<byte[]> newSerializer) {

        return newSerializer instanceof EncodedValueSerializer

            ? TypeSerializerSchemaCompatibility.compatibleAsIs()

            : TypeSerializerSchemaCompatibility.compatibleAfterMigration();

      }

    };

  }

}